#!/bin/bash read -p 请输入一个地址: IP

  • [[ "$IP" =~ ^(([1-9]?[0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]).){3}([1-9]?[0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])$ ]] && echo it is ok